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Risk to Humans Seen in New Bird Flu Strain

In the heart of winter's flu season, scientists have discovered another strain of avian flu capable of spreading to humans. Hong Kong University epidemiologist Ben Cowling tells Deborah Kan how worrying this strain of the virus is.

BEIJING—Scientists warned that a strain of avian flu has mutated and can now infect humans, requiring close scrutiny, while authorities were cautiously watching another strain making its way through China.

The Lancet medical journal said in a study published Wednesday that a strain of the H10N8 avian flu mutated and can now be carried by humans. The study followed findings by Chinese researchers that the H10N8 flu had been found in...